E=mc2 explain?

Answer 1

E=mc2 is an equation about mass-energy relationship. In this equation, Albert Einstein concluded that mass and energy are interchangeable.

E is the amount of energy obtained by converting an amount of mass (m) to energy, and c is the speed of light (3.0 x 10^8 m/s). The value c2 is a large amount of number, and so a large amount of energy can be obtained from the conversion of a small amount of mass. Energy can also be converted into mass, but only a small amount of mass is created from a large amount of energy.

The large scale conversion of mass into energy is more feasible; it is used in daily as a source of energy. Nuclear power plants costing hundreds of millions of dollars convert part of their uranium fuel into thermal energy, which is converted in a complicated series of steps into electrical energy. Nucleur weapons also convert mass into energy in uncontrolled explosions. A little amount of uranium used as a bomb can unleash an energy so powerful that a deadly explosion occurs.

Answer 2

This is the famous Einsteins's equation of mass and energy equivalence and is the basis of all our nuclear reactors and of course the nuclear warheads (bombs).

What it means is that if a mass 'm' disappears from the universe (not by experimental error, but really), it has to manifest itself as energy, electromagnetic radiation. 'c' is the velocity of light in vacuum and E is the equivalent energy released. Since c is a big number, nearly 3 x 10 raised to the power of 10 cm/sec, E will be a large number even for a small m. Thus when an atom of Uranium 235 splits when hit by a neutron, a small quantity of mass disappears and energy of 200 MeV is released. Since 2 or 3 neutrons are also released along with other fission fragments, further fission takes place under certain conditions and we have a chain reaction and consequent release of large amount of energy which if uncontrolled results in explosion or if controlled results in production of electricity etc.

There is another angle for this equation. Under certain conditions, energy can manifest itself as matter, yes! A high energy gamma ray (visible light, x-rays and gamma rays ... all are forms of electromagnetic radiation of different frequencies and thus different energies) can suddenly transform itself into a pair of electron and its 'mirror' positron. A positron is identical with an electron except for the charge being opposite, i.e positive.

Even Sun, the nearest star to us, gives light and heat through this mass-energy conversion but the process is nuclear fusion, just like two drops of water merge to form one drop. Hydrogen nuclei fuse to form Helium and again a small mass is lost and comes out as energy.

So, our very existence is due to this equation.

Answer 3

E=MC^2. Here E represents energy, m represents mass, and c² is a very large number, the square of the speed of light, Einstien was the first to discover the relationship between mass and energy

Answer 4

This is Einsteins Theory of Relativity.

E engergy is equal to M mass in proportion to the speed of light in a vaccum C and that is squared.

Answer 5

E = Energy
M = mass
C = speed of light
2 = means that speed of light squared.

This means that energy is equal to the mass of an object times the speed of light squared.

Answer 6

energy = mass times the speed of light squared.

Answer 7

It means that energy isn't mass-less, because mass is used to calculate E.
In turn, it means that mass has energy, by m=E/(c^2), which is why an object at rest has potential energy.

Answer 8

this is the speed of light